Thermophysical and Mechanical Properties of Advanced Single Crystalline Co-base Superalloys

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Volz N, Zenk C, Cherukuri R, Kalfhaus T, Weiser M, Makineni SK, Betzing C, Lenz M, Gault B, Fries SG, Schreuer J, Vassen R, Virtanen S, Raabe D, Spiecker E, Neumeier S, Göken M
Zeitschrift: Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science
Verlag: Springer Boston
Jahr der Veröffentlichung: 2018
Seitenbereich: 1-11
ISSN: 1073-5623
Sprache: Englisch


Abstract



A set of
advanced single crystalline γ´ strengthened Co-base superalloys with at least
nine alloying elements (Co, Ni, Al, W, Ti, Ta, Cr, Si, Hf, Re) has been
developed and investigated. The objective was to generate multinary Co-base
superalloys with significantly improved properties compared to the original
Co-Al-W-based alloys. All alloys show the typical γ/γ´ two-phase
microstructure. A γ´ solvus temperature up to 1174 °C and γ´ volume fractions between
40 and 60 pct at 1050 °C could be achieved, which is significantly higher
compared to most other Co-Al-W-based superalloys. However, higher contents of
Ti, Ta, and the addition of Re decrease the long-term stability. Atom probe tomography
revealed that Re does not partition to the γ phase as strongly as in Ni-base
superalloys. Compression creep properties were investigated at 1050 °C and 125
MPa in <001> direction. The creep resistance is close to that of first
generation Ni-base superalloys. The creep mechanisms of the Re-containing alloy
was further investigated and it was found that the deformation is located
preferentially in the γ channels although some precipitates are sheared during
early stages of creep. The addition of Re did not improve the mechanical
properties and is therefore not considered as a crucial element in the design
of future Co-base superalloys for high temperature applications. Thermodynamic calculations
describe well how the alloying elements influence the transformation
temperatures although there is still an offset in the actual values. Furthermore,
a full set of elastic constants of one of the multinary alloys is presented, showing
increased elastic stiffness leading to a higher Young’s modulus for the investigated
alloy, compared to conventional Ni-base superalloys. The oxidation resistance
is significantly improved compared to the ternary Co-Al-W compound. A complete
thermal barrier coating system was applied successfully.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Göken, Mathias Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Lenz, Malte
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Neumeier, Steffen Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Virtanen, Sannakaisa Prof. Dr.
Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Volz, Nicklas
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Weiser, Martin
Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Zenk, Christopher
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)


Zusätzliche Organisationseinheit(en)
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


Einrichtungen weiterer Autorinnen und Autoren

Forschungszentrum Jülich / Research Centre Jülich (FZJ)
Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research
Ruhr-Universität Bochum (RUB)


Zitierweisen

APA:
Volz, N., Zenk, C., Cherukuri, R., Kalfhaus, T., Weiser, M., Makineni, S.K.,... Göken, M. (2018). Thermophysical and Mechanical Properties of Advanced Single Crystalline Co-base Superalloys. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 1-11. https://dx.doi.org/10.1007/s11661-018-4705-1

MLA:
Volz, Nicklas, et al. "Thermophysical and Mechanical Properties of Advanced Single Crystalline Co-base Superalloys." Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science (2018): 1-11.

BibTeX: 

Zuletzt aktualisiert 2019-27-05 um 16:55